Question

срочно нужно помогите

Answer 1

7) 49d²-25а² = (7d-5а)(7d+5а)

8) 4-36а^6 = 4(1-9а^6) = 4(1-3а³)(1+3а³)

9) (х²+1)²-4х² = (х²+1-2х)(х²+1+2х) = (х²-2х+1)(х²+2х+1) = (х-1)²(х+1)²